IN74HC21A
AC ELECTRICAL CHARACTERISTICS (CL=50pF,Input tr=tf=6.0 ns)
VCC
V
Guaranteed Limit
Symbol
Parameter
Unit
ns
25 °C
to
≤85°C ≤125°C
-55°C
tPHL, tPLH Maximum Propagation Delay (Figure 1)
2.0
4.5
6.0
110
22
140
28
165
33
19
24
28
tTHL, tTLH Maximum Output Transition Time
(Figure 1)
2.0
4.5
6.0
75
15
13
95
19
16
110
22
19
ns
CIN
Maximum Input Capacitance
5.0
10
10
10
pF
Power Dissipation Capacitance (Per Gate)
TA=25°C,VCC=5.0 V
CPD
Used to determine the no-load dynamic power
consumption:
50
pF
PD=CPDVCC2f+ICCVCC
tLH
tHL
V1
0.9
0.9
V2
Input
V2
GND
0.1
0.1
tPLH
tPHL
VCC
0.9
0.9
V2
V2
Output
0 V
0.1
0.1
tTHL
tTLH
V1 = 0.5 VCC
Figure 1. Switching Waveforms
VCC
VI
VO
Termination resistance RT – should
be equal to ZOUT of pulse generators
DEVICE
UNDER
TEST
PULSE
GENERATOR
RT
CL
50 pF
Figure 2. Test Circuit
Rev. 00
IKSEMICON [ IK SEMICON CO., LTD ]
